This is a Muji LED mobile light in white. Although it's white, it has yellowed with age. I'm offering it at a low price for those who are okay with that. I've confirmed that it works with both batteries and a power source. I bought it quite a while ago. However, I don't think I've used it more than 100 times. ・Size (when stored): Approximately W3.5 x D14.6 x H3.3cm, Weight: Approximately 108g (excluding batteries) ・Continuous operating time: Battery life (when using alkaline batteries): (High) Approximately 5 hours, (Low) Approximately 13 hours ・Off/Switching method/Lighting mode: 2-step dimming (High) Bright → (Low) Slightly dim → Off ・Cord length: (Total length) Approximately 180cm ・Usability of rechargeable batteries: No, Compatible battery size and number required: 4 AAA batteries (sold separately)